Question

If the perimeter is 240m and the bredth is 20m then what is the height?​

Answer 1

$240 = 2(20 + x) \\ 120 = 20 + x \\ 120 - 20 = x \\ 100 = x$

as

$prametr = 2(l + b)$

hope it helps ☺

Answer 2

The height be x.

2(b+h)=240

b+h=120

h=120-b

h = 100